The 2022 LS 500's 3.5L twin-turbo V6 (V35A-FTS) is largely reliable, but a small percentage suffer catastrophic low-speed pre-ignition (LSPI) failures causing total engine destruction, plus the 10-speed transmission has known oil-cooler and mount weaknesses that need monitoring.
Low-Speed Pre-Ignition (LSPI) Engine Failure
Rare · high severityTypical onset: 10,000-60,000 mi
Symptoms: Sudden catastrophic knocking under light acceleration at low RPM (1,500-2,500), Metal debris in oil, followed by immediate loss of power, Check engine light with misfire codes, often too late, Complete engine seizure in worst cases
Fix: Total engine replacement or complete rebuild including pistons, rings, bearings, and crankshaft inspection. 25-35 labor hours for short-block swap, 40-50+ for full teardown rebuild. TSB exists but no recall yet. Some warranty extensions granted case-by-case.
Estimated cost: $15,000-25,000
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 40,000-80,000 mi
Symptoms: Red ATF pooling under front of vehicle, Transmission temperature warning on dash, Burnt smell from engine bay, Slipping or delayed shifts if fluid level drops significantly
Fix: Replace oil cooler lines and fittings where they connect to radiator or auxiliary cooler. Often the quick-connect fittings crack. 2-3 hours labor, requires lift and fluid refill/flush.
Estimated cost: $600-1,200
Rear Transmission Mount Collapse
Occasional · low severityTypical onset: 50,000-90,000 mi
Symptoms: Clunk or thud on acceleration from stop, Vibration through floor at idle in Drive, Excessive driveline movement visible during throttle blips in Park, Harsher shift quality
Fix: Replace rear transmission mount. The rubber separates from the metal bracket. 1.5-2 hours labor, need to support transmission from below.
Estimated cost: $400-700
High-Pressure Fuel Pump Failure (Port Injection Side)
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Hard starting after sitting overnight, Rough idle and hesitation on cold start, P0087 fuel pressure low code, Audible ticking from fuel pump area under hood
Fix: Replace high-pressure fuel pump (this engine has both port and direct injection; the port-side pump typically fails first). 3-4 hours labor, buried behind intake components.
Estimated cost: $1,200-2,000
Head Gasket Seepage (Not Catastrophic)
Rare · low severityTypical onset: 70,000-120,000 mi
Symptoms: Slight oil weepage at head/block mating surface, Minimal coolant consumption (ounce every few thousand miles), No overheating or white smoke, Visible staining on block exterior
Fix: If caught early and not mixing fluids internally, can often monitor. Full head gasket replacement is 18-24 hours labor due to timing chains, turbos, and tight packaging. Most don't require immediate action unless progressing.
Estimated cost: $4,500-7,000
Spectacular when it works, but the LSPI engine-grenade risk—even if under 1% of units—makes this a hard sell used without remaining factory or extended warranty coverage.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.